Stumbled onto this a couple weeks ago. Thought it was just your average S&W Model 10-6; 38 Special HB. Many, many LE agencies used them at the end of the revolver era and traded them in for the Wonder 9's and 40's. I've owned several. Looked at this, labeled 357 Magnum, chambers are bored deep for 357 Magnum. I've heard of Model 10's in 357 but never seen one. I played it away and started searching info. It seems that New York State Police ordered 1200 of these and then S&W came out with the Model 13. NYSP traded all of these in on Model 28 Highway Patrolman 357's. S&W released these Model 10-6 357 magnums. I decided I had to have it simply because it is a somewhat scarce commodity. Pics: